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authorPaolo Abeni <pabeni@redhat.com>2017-03-30 14:03:06 +0200
committerDavid S. Miller <davem@davemloft.net>2017-03-30 20:05:24 -0700
commit6c7c98bad4883a4a8710c96b2b44de482865eb6e (patch)
tree0995daa9a97afde4b675dea6054701d04404a3ac /net/core/sock.c
parent7801a3225e7fe05f7601ab42a5669ba633c4df54 (diff)
sock: avoid dirtying sk_stamp, if possible
sock_recv_ts_and_drops() unconditionally set sk->sk_stamp for every packet, even if the SOCK_TIMESTAMP flag is not set in the related socket. If selinux is enabled, this cause a cache miss for every packet since sk->sk_stamp and sk->sk_security share the same cacheline. With this change sk_stamp is set only if the SOCK_TIMESTAMP flag is set, and is cleared for the first packet, so that the user perceived behavior is unchanged. This gives up to 5% speed-up under udp-flood with small packets. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock.c')
-rw-r--r--net/core/sock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 1a58a9dc6888..392f9b6f96e2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2613,7 +2613,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
- sk->sk_stamp = ktime_set(-1L, 0);
+ sk->sk_stamp = SK_DEFAULT_STAMP;
#ifdef CONFIG_NET_RX_BUSY_POLL
sk->sk_napi_id = 0;